Punching and drawing press



Nw., 28, R95@ O. F. A. BIGINELLI ET AL PUNCHING AND DRAWING PRESS 2Sheets-Sheet l Filed Dec. l2, 1947 INVENTORS ATTORNEYS Nw., 1950 o. F.A. BIGINELLI ET AL PUNCHING AND DRAWING PRESS 2 Sheets-Sheet 2 FiledDGO. l2, 1947 INVENTORS Patented Nov. 28, 1950 UNITED STATES PATIENT@OFFICE PUNGHING AND DRAWING PRESS` Greste Flavio Alfred 'BiginellLPietro Alexanilro Maggiorinc Biginelli, and Alexandro Giovanni BattistaAndrea Biginelli, ClermonteFerrand,

`France Application December 12, 1947,-Serial No. 791,436 in FranceDecember 27, 1946 1 Claim. l1

Metallic cases of cylindrical shape `are generalliy worked on mechanicalpresses which successively effectuate `the operations which consist in.cutting out `the blank, dishing said blank, drawingfthe dished piece.

.It is :then necessaryto arrange different presses following one anotherand successively effectuating the three operations of cutting out,dishing anddrawing; each of said presses being made especially yfor oneof said operations.

Furthermore, each Vpress is generally provided with afdevice supplyingthe pieces automatically and increasing thecapacity of production of thepress.

The -plant which is necessary for making the finished cases is thus veryimportant and very expensive since it comprises three presses and threeautomatic piece supplying devices.

The present invention has for its object to remedy said inconveniences.

The invention relates to a machine for the manufacture Aol deep metallicvessels such as cases, characterized in that female cutting out, dishingand drawing tools are arranged axially after one another which makes itpossible, in one andthe same `working operation, to cut out, dish and4'draw the blank in order to obtain a deep vessel `in its definitiveshape.

According to a form of execution of the invention the female cuttingout, dishing and drawing tools are combined with male tools such aspunches actuated by a press mechanism.

According to a feature of the invention the punches Kcomprise a out outpunch and a dishing and drawingpunch concentric with the preceding oneand capable of projecting through this :cut out punch which makes itpossible successively to effectuate the cutting out of the blank and`then the deformation of said blank.

According to a form of execution of the invention a retaining devicesuch as an extractor is arranged after the female tools in order toretain lthe worked piece while the dishing and draw" ing' punch returnsto its initial position after its Working stroke.

The invention also covers a machine characterized in that the `dishingand drawing punch alone receives the thrust of the `press mechanism, thecutting out punch being capable, at certain moments, of being renderedfast with said dishing and drawing punch. According to a feature of theinvention the dishing `and drawing punch passes axially through thecutting out punch which vis fast with a Istop able lto recede, thedishing and drawing punch carrying along the cutting out punch in itsmovement when it strikes against the :stop of the latter.

Lastly, the invention covers the features which will be described nowand Vtheir various possible combinations.

.A machine made in accordance with the invention isshown `by way ofexample in the appended drawings, in which:

Figure l is a sectional axial view, the cutting out and .dishing punches:being in their raised position.

Figure 2 is a sectionalaxial viewshowing the machine at the `moment whenthe cutting out punch comes into VContact 4with the `strip to be cutout.

Figure 3 is a .sectional ,axial view of the `machine, the cutting outpunch being at the end of Tits working stroke.

Figure 4 is a sectional `axial view ofthe machine showing the Ydishing`punch at the end o its Working stroke.

Figure 5 is a cross-sectional view of this machine through line 5-5 ofFigure 1.

Figure l6 ris a crossesectional `View `of Ythe machine through lineS-Brof Figure 2.

Figure '7 is a cross-sectional view of `the ma' chine'through line 'I-lof Figure 3.

The apparatus 4shown in Figures l to 7 iorms only the Working `device cithe machine, it being `actuated through a press mechanism of known type.

It comprises the ,following essential elements:

(l) A iixed casing fast with the yoke of the press and formed of twoparts I and 2 assembled through four screws 3 so as to provide betweenthem a rectangular port `serving as a guide for the passage of the metalstrip.

(2) A movable rod 5 entirely fast with the press work and sliding alongthe longitudinal axis of the stationary casing.

(3) A sliding -sleeve 6 which can be rendered fast with the rod 5 orremain independent of said rod. This sleeve 6 can slide in the casing 2on a rather reduced length while the rod 5 itself can slide in the boreof the sleeve.

(4) Female tools arranged in the central bore of part I of the casing(I, 2). These to'olscomprise from the top to the bottom:

(a) A ring I the upper `part B of which `acts as a die for cutting outthe 'blank and the lower part of which serves as a dishing die (b) Aseries of drawing rings `Ill, II, I2, I3, four in the case Aof `theexample shown, the did ameters 'of which are more and more reduced fromthe top to the bottom. These rings IIJ, Il, I2, I3 are maintained spacedfrom one another, as desired, through a series of spacing rings I4, I5,I6, Il. The upper ring I4 outwardly comprises a groove 25 into whichopen holes 26 which, on the other hand, open into the inner bore of thering I4.

The groove 25 of the ring I4 is placed opposite the opening of a passage21 provided in the casing I. A pump, not shown, forces oil through thepassage 21, the groove 25 and the holes 26 into the -bore of the ringI4.

The whole of the drawing dies I0, II, I2, I3 and of the spacing ringsIfi, i5, I", il is located in the axial bore of part I of the casing; itis maintained in said bore through a sleeve i8 locked through a washeri9 itself maintained applied against the casing I through a nut 2Gscrewed on said casing. The washer l and the nut 20 are provided with anaxial hole 42.

The sleeve i3 comprises in its upper part a conical bore 2l againstwhich the six clamping members such as sectors 23 of an extractor 22 arepressed through a spring 24 located in the sleeve i8. rilhe spring 24rests, on the other hand, on the washer The six sectors 23 of theextractor 22 which are shown in Figure 6 have each an opening of 60 andform through their bringing together a continuous ring resting through aconical part against the conical bore 2I of the sleeve I8.

(5) Male tools formed of:

(a) A dishing and drawing punch 23 secured through a nut 29 to the endof rod 5;

(b) A cutting out punch 3d secured through a nut 3| to the lower part ofthe sliding sleeve E; said cutting out punch 3U comprises an axial bore32 rendering possible the passage of the dishing and drawing punch 28.

The above mentioned punches can be rentiered fast with one another bymeans of a capnut 33 screwed on the upper part of the sliding sleeve Eand against which the nut 29 which is fastwith the punch 28 can come torest.

lThree radial keys (Figures 1 and 7) are slidably mounted in threeguides spaced by 120 and provided in the sliding sleeve These keys areurged by a pin-spring 35 which tends to move them apart radially and tocause them to rest against the internal surface of the cylin- I dricalpart 2 of the casing.

This internal surface comprises in its upper part a iirst cylindricalbore then a second cylindrical bore 3l of larger diameter connected withthe iirst bore through a conical bearing surface 3S the angle of whichis about 45 with respect to the general axis. Lastly, the cylindricalbearingv surface 3l blends with the general bore Q3 of the casingthrough a transversal bearing surface M, acting as a stop.

The radial keys Sie, which are moved away resiliently through thesprings 35 can thus occupy two positions:

(o) The position of 'Figures l and 2 in which the keys Se in contactwith the restricted part of conical bearing surface 323 are broughtnearest to the general axis.

In this position the keys 35i form through their internal end whichprojects into the bore of the sliding sleeve a stop icr the nut 29 whichis fast with the punch 2t.

(o) rEhe position of Figures 3, 4 and 7 in which the keys 34 spaced fromthe axis through the springs 35 rest against the bore 31 which formsthe'bottom of the groove.V In this position the keys 34 do no longerproject into the bore of the sliding sleeve 6 and the nut 29 can slidefreely in said bore.

The above described machine Works in the following manner:

The metallic strip 4 which is chosen with a width larger than thediameter of the blank which will be punched out by the cutting out punchSii is introduced into the space forming a guide between parts I and 2of the casing (Figures 1 and 2, 5). The dishing and drawing punch 28 isin its upper position and maintains the cutting out punch 3s in itshigher position owing to the fact that the nut 29 strikes against thecap-nut 33 which is fast with the sliding sleeve 6 (Figure 1).

The press-work being actuated the dishing and drawing punch 28 beginsits downward stroke, the nut 23 comes then to strike against the keys35i which project into the bore of the sliding sleeve t and carriesalong this sleeve and the cutting out punch 3i] in its downwardmovement. Figure 2 shows the position of the various organs at themoment when the cutting out punch comes into contact with the strip 4during its downward stroke.

During the further downward movement of both punches 28, 3B which arefast with each other the punch 35 cuts out the blank 4 on the upper ring8 and forces it into said ring 8 without deforming it till the beginningof the dishing die In this position the cutting out die is locked owingto the fact that the nut 3l strikes against the bottom of the bore ofthe casing 2 (Figure 3). t the same time the keys 34 which areresiliently moved apart from one another through the springs 35 engageinto the groove formed through the bore with the large diameter 3l andfree the nut 29 which can then continue its downward movement with thepunch 28 while the sleeve is held fast through striking against thecasing 2 (Figure 3).

Therefore, the dishing and drawing punch continues its downward movementalone. During this stroke the dishing of the blank through the die S andthen the successive drawings through the rings ill, II, I2, I3 areeffected successively. At the end of the downward stroke the punch 28occupies the position shown in Figure l and carries at its end thenished piece such as a case el.

Then the press mechanism produces the displacement of the head in thereverse direction, the punch 23 rises again, the sectors 23 of theextractor 22 are forced through the spring 24 into the conical bore 2iWhere they press against case si and through clamping oppose any upwarddisplacement of said case. Therefore, the punch 28 gets free from thecase 4I which is held fast in the axial passage 42 and which will beejected during the following press stroke by the following piece throughthe axial hole 42 of the nut 2U.

Towards the end of the upward stroke of the piston il@ the nut 29 comesto strike against the cap-nut 33 and carries the sliding sleeve 6 withit in its upward stroke which causes the raising movement of the cuttingout punch 30.

In this upward movement of displacement of the sliding sleeve S in thecasing I the keys 34 are forced back towards the axis while compressingthe springs 35 through sliding of the outer end of said keys against theconical part 28 which forms an inclined plane. Then the keys 34 projectagain into the inner bore of the slid- 5 ing sleeve 6 and the variousorgans are again in the initial position of Figure l.

The freed strip 4 can then be shifted longitudinally either manually orautomatically by a length somewhat larger than the diameter of the blankcut out by the punch 30.

While the strokes to and fro of the punches are eifected an abundantsupply of oil provided at 21 opens through the medium of the groove 25and of the holes 26 into the inner bore of the dies. This oil has forits duty to lubricate and to cool the tools, punches and dies; it flowsout through the ejection hole t2.

The above described machine makes it possible to insure numeroustechnical advantages and more particularly the following ones:

(l) It makes it possible to obtain a piece such as a case from a metalstrip by means of a single machine and with a single press stroke whichproduces the cutting out, dishing and drawing operations simultaneously,

The work is thus rapid and the efficiency of the machine is very high.

(2) The machine according to the invention can be fed through anautomatic supplying device the Work of which is reduced to the supply ofthe strip to the machine which is a simple and not very expensivedevice.

In short, the machine made in accordance with the invention makes itpossible to obtain together with a high eiciency a plant comprising onlya single machine and a single automatic supplying device, thus a plantwhich is much less important and much less expensive than the knownplants which comprise machines i for each operation and automaticfeeding devices for each machine.

We claim:

In a machine for the manufacture of deep metallic containers such ascases from a continuous metallic strip, the combination comprising acasing of generally elongated form, divided into an upper portion and alower portion by a transverse slot for guiding the strip to be cut,

said upper portion having a cylindrical recess,

a sliding sleeve displaceable in said cylindrical recess, a cap mountedupon the upper portion of said sliding sleeve, a conical bore formingperipheral inclined slopes in the internal face of said cylindricalrecess throughout all of its priphery, a cylindrical enlarged boreprovided in said cylindrical recess below and following said conicalbore, a cutting punch carried at the lower end of said sliding sleeve, adishing-drawing punch sliding axially in said sliding sleeve and capableof projecting beyond said cutting punch, pressure means, an assemblingnut connecting the upper portion of said dishing-drawing punch to saidpressure means and forming an abutment against said cap for raising saidsliding sleeve by said dishing drawing punch, radiating keys mountedradially slidingly in said sliding sleeve, springs applied to saidradiating keys and maintaining them in exterior engagement with saidconical bore and said enlarged boring, said radiating keys being thuscapable of projecting into the bore of the sliding sleeve when they arein exterior engagement with the walls of the conical bore and thusforming an abutment for said nut in its descending stroke, saidradiating keys being moved aside when they are in contact with saidenlarged cylindrical bore which permits the projection of saiddishing-drawing punch across said immobilized cutting punch, cuttingfemale dies, dishing female dies, drawing female dies, said female diesbeing disposed axially following one another in the interior of thelower portion of the casing upon the trajectory of said punches.

ORESTE FLAVIO ALFRED BIGINELLI. PIETRO ALEXANDRO MAGGIORINO BIGINELLI.ALEXANDRO GIOVANNI BATTISTA ANDREA BIGINELLI.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date Re. 23,095 Keller Mar. 29, 1949530,915 Adams Dec. 18, 1894 1,720,375 Parker July 9, 1929 2,369,260Slater Feb. 13, 1945 2,389,738 Olney Nov. 27, 1945 2,412,813 Keller Dec.17, 1946

